Petroleum incandescent-lamp burner.



No. 643,807. Patented Feb. 20, I900. J. BRAUNSCHILD.

PETROLEUM INCANDESCENT LAMP BURNER.

(Application filed Kay 20, 1899.)

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No. 643,807. Patented Feb. 20, I900.

J. BRAUNSCHILD. PETROLEUM INCAN DESCENT LAMP BURNER.

(Application flied May 20, 1899.)

(No Model.) 2 Sheets-Sheet 2.

INVENI'UR WITNESSES:

ATTORNEYS UNITED STATES JULIUS BRAUNSCI-IILD,

PATENT Fries.

or MUNICH, GERMANY.

PETROLEUM lNCANDESCENT-LAMP BURNER.

SPECIFICATION forming part of Letters Patent No. 643,807, dated February 20, 1900, Application filed May 20, 1899. Serial No. 717,581. (No model.)

To aZZ whom it may concern;

Be it known that I, JULIUs BRAUNSOHILD, a subject of the King of Bavaria, residing at Munich,Bavaria, Germany,have invented certain new and useful Improvements in Petroleum Incandescent-Lamp Burners, of which the following is a fuil, clear, and exact description.

The object of this invention'is apetroleum incandescent lamp with a burner which can be easily applied to petroleum lamps f urnished with round burners.

Figure 1 of the accompanying drawings is a vertical section of the new lamp; Fig.2, a side View; and Figs. 3 and 4 are cross-sections on the lines a b c d, respectively.

It is known that a wire screen or perforated metal sheet may draw so much heat from a flame that the burning of the gas does not extend'beyond the upper part of the screen. It is quite true that use has been made of this property of the wire screen to produce petroleum gas and therewith petroleum incandescent light. Attempts have heretofore been made having that end in view. In one attempt by means of aperforated cap certainly an incomplete combustion is brought about in the lower part thereof and the unburned gas is compelled to flow to the upper part of the cap. The flame produced on the wick when a curved or arched wire screen of the kind is employed is illuminating, and therefore the screen in a short time becomes smoked or sooty, so that finally no more gas can penetrate through it. This difficulty can be obviated by placing a flat or slightly-bentunder wire screen or perforated sheet metal on the upper edge of the wick. Hereby a small blue flame is produced on the inside of the wick which does not smoke'the wire screen, so that the combustion can proceed constantly.

The construction of the new apparatus is as follows: A flat wire screen a, which rests on the upper edge of the wick while the lamp is burning, is moved upward and downward by means of the wick in a cylindrical guide I), made of perforated sheet metal. This guide I) is one furnished with an internally-projecting flange c, of sheet metal, the breadth of which is precisely such that it comes almost into contact with the outer wick-tube. This guide-casing b forms, by means of the circular disk d, with the casing e, the chamber f. The sheet-metal casing e is likewise surrounded by a casing e, in which the former is adjustably arranged by means of a bayonetclosure g g or the like. The inner sheet-metal casing e is shut off at the top by a plate h, which is furnished on the outer edge with holes 2'. Above the plate h the chamber f narrows into the chimney 7c, in which two semicircular plates Z are placed at a distance apart from each other.

The closing of the new apparatus is formed by a conical wire or perforated-sheet-metal screen m, shut off at the top, whichis arranged on the upper edge of the chimney 76 in such a manner that there is but a very small space between the upper edge of the chimney and the wire screen. The incandescent mantle n or its holder ois fixed,together with the holder for the cylinder 13, to a tube g, which is placed over the chimney 7c.

The production of the petroleum incandescent light is effected thus: After the casing c has been raised up and fixed and a spirit round burner 0" put on the chimney 7c the wick is lighted through the opening 3 in the casing e. In this position the wick is allowed to burn with a very small flame, whereby the burner is to some extent preliminarily heated. Hereupon the apparatus is lowered to about the position indicated by the letter g and the wick turned up somewhat, so that the flame, hitherto burning only on the upper edge of the wick, extends to the inner and outer edge of the same. The apparatus is now let down completely, so that the sheetmetal flange 0 almost entirely shuts off the outer edge'of the wick from the supply of air.

In consequence of this the flame on the outer edge of the wick goes out, while on the inner edge of the wick the flame is quite small and completely blue, the wire screen ct being on the upper edge of the wick. The result of this is that the gas on the outside of the wick flows away. Through the openings of the perforated guiding-cylinder 17 air now flows below the flange 0 into the chamber f, is there considerably heated, and mixes with the gas flowing over-the flange c to the chamberf. The air is thus conveyed sidewise into the chamber f in order that it may hold back the gas there as long as possible and mix thoroughly with it. In order to render the mixing of the gas and air more complete, the gas must be retarded at the plate 7t and can only then be drawn off through the holes 2' to the chimney 70. Here the mixture of petroleum gas and air is forced by the semicircular plates Z to mix still further, after which it reaches the shutoff conical perforated-sheetmetal or wire screen m, and outside of the same brings the incandescent mantle it into a luminous condition. I'Iereupon the upper edge of the chimney becomes heated and transmits the heat to all parts in connection with it. The new lamp is further regulated like an ordinary petroleum-lamp by means of an adjusting-pinion t. Any undue turning up of the wick, however, whereby the incandescent body would be smoked is avoided byasuitable contrivance it, which acts on the wire screen.

The spirit round burner '1' is not indispensably necessary for igniting the lamp, but

serves chiefly for consuming the petroleumvapors given off during the preliminary heating, and thereby obviates the disagreeable smell.

The lamp is extinguished by lowering the wick, so that the wire screen a rests on the wick-casing, whereupon no further gas is generated.

Having thus described my invention, what I claim is An incandescent petroleum-burner having a wick-tube, a cylindrical guide encircling the same provided with perforations, and a wire sieve movable vertically within said guide and resting upon the wick substantially as described.

In witness whereof Isubscribe my sign atn re in presence of two witnesses.

EMIL HENTZEL, M. MENDELsoHN. 

